Abstract
More than 40 years ago, Wilson et al. emphasized the importance of photosynthesis for symbiotic nitrogen fixation in legumes by increasing N2 fixation with CO2-enrichment techniques.1 Since that time numerous experiments have suggested a connection liqetween those processes by demonstrating that defoliation,2 surgical treatment,3 supplemental light,4 and grafting a second shoot on a rootstock5 produced changes in symbiotic N2 reduction with paralleled changes in net photosynthesis. More recent experiments with CO2 enrichment of field-grown legumes have shown that both the total amount of N2 fixed and the proportion of nitrogen derived from N2 as opposed to soil nitrogen increased.6 KeywordsRoot NoduleRelative EffiSymbiotic Nitrogen FixationCarboxylation EfficiencyTrifoliate LeafThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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